Several small new fires broke out about 3:15 p.m. along the edges of the charred swaths of hilly terrain east of Interstate 15 and about a mile south of the Riverside County line, according to Cal Fire, which dispatched ground crews firefighting aircraft to douse the flames.
Within two hours, about 25 additional acres had burned, said Kendal Bortisser, a fire captain with the state agency. Sheriff's deputies cleared people out of homes in the nearby Rancho Heights area as a precaution.
The original blaze began Tuesday afternoon as a house fire in the 38800 block of Pala Temecula Road. The flames quickly spread into adjacent trees and brush and began moving through thick foliage on surrounding rural lands.
Authorities evacuated about 100 residents in the area of Temepa Road as the fire grew. They were allowed to return to their homes early Tuesday evening, as crews gained control over the flames.
As of Friday morning, firefighters had the blackened footprint of the blaze 95 percent contained, Cal Fire reported.